Peptides are more fragile than the small molecules most laboratories are used to handling. A compound that arrives at 99.8% purity can degrade meaningfully within weeks if it's stored carelessly — not because the original testing was wrong, but because peptide bonds and secondary structure are genuinely sensitive to heat, light, moisture, and mechanical stress. This is a practical overview of why, and what actually helps.
Lyophilized versus reconstituted
Our compounds ship as lyophilized (freeze-dried) powder for a reason: removing water dramatically slows the chemical pathways that degrade peptides, primarily hydrolysis and deamidation. A sealed, dry, cold vial of lyophilized powder is the most stable form the compound will ever be in.
Once a peptide is reconstituted in a diluent, that protection is gone. Water re-enables the degradation pathways lyophilization was suppressing, so a reconstituted solution has a meaningfully shorter usable window than the dry powder it came from — typically measured in weeks under refrigeration, not months. Reconstitute only what a given research session requires, and treat the clock as starting the moment diluent is added.
Temperature
Heat accelerates degradation kinetics, which is why lyophilized vials should be kept frozen (around –20°C) for long-term storage and reconstituted solutions kept refrigerated rather than at room temperature. Repeated freeze-thaw cycles carry their own cost — each cycle exposes the compound to a burst of the same degradation pathways, plus mechanical stress from ice crystal formation. Where practical, aliquoting a batch before freezing avoids repeatedly thawing the same stock vial.
Light exposure
Many peptides contain residues that are photosensitive, meaning prolonged exposure to light — particularly UV and bright ambient light — can drive oxidative degradation. This is the reason our vials are stored and shipped in a way that limits light exposure, and why "protect from light" appears on every specification sheet in our catalogue. In practice, this simply means keeping vials in their original packaging or a light-blocking container when not in active use, rather than left out on a benchtop.
Handling during transit and receipt
We ship from our Adelaide facility with packaging designed to limit temperature and light exposure in transit and tracked delivery so you know when a shipment has arrived. On receipt, the practical step that matters most is promptness: move lyophilized vials to appropriate frozen storage as soon as the package is opened, rather than leaving it on a bench for the rest of the day. If a shipment has been delayed or exposed to unusual conditions in transit, that's worth noting against the batch record.
A short practical checklist
- Store lyophilized powder frozen, protected from light, until reconstitution.
- Reconstitute only the quantity needed for near-term use.
- Keep reconstituted solutions refrigerated and use within a limited window.
- Minimise freeze-thaw cycles — aliquot before freezing if a batch will be used over multiple sessions.
- Log receipt date, storage conditions, and batch number alongside your COA for traceability.
Batch-specific storage notes are included on every Certificate of Analysis. If you're unsure how a particular compound in our catalogue should be stored, check its specification table on the product page or get in touch.